TM5-4210-229-14&P5-12.ALTERNATOR REPAIR (Continued).n.Using a bearing puller remove drive end housing(20) and bearing assembly (35) from the rotor shaft(19).o.Remove four screws (36) and bearing retainer (37)and press bearing out of drive end housing.p.With a heat gun, remove wire (38) that connects therotor coil (19) to the outside slip ring (39). Unsolderthe wire from the inside slip ring (40) and with abearing puller, remove the slip ring assembly andinsulation washer (41).q.Using a bearing puller, remove the bearing (42).TESTNOTEBefore performing these tests, inspect all partsfor wear, cracks, or other mechanical defects.Replace all damaged parts.a.Positive heat sink test.NOTEThe positive heat sink is the one to whichpositive output terminal is connected. Thesquare hole in the positive heat sink is largerthan the negative heat sink hole.(1) Connect the positive lead of the test lamp tothe positive heat sink and touch the negativetest lead to each of the three diode terminals.The test lamp should not light. If the testlamp lights, the diode is shorted.(2) Reverse the test leads so that the negativetest lead is connected to the positive heatsink. The positive test lead should now betouched to each diode terminal. If the testlamp fails to light, an open diode is indicated.(3) If a shortened or open diode is detected,replace the entire heat sink assembly.b.Negative heat sink test.(1) Connect the negative lead of the test lamp tothe negative heat sink and touch the positivetest lead to each of the three diode terminals.The test lamp should not light. If the test lamplights, the diode is shorted.(2) Reverse the test leads so that the positive testlead is connected to the negative heat sink.The negative test lead should now be touchedto each diode terminal. If the test lamp fails tolight, an open diode is indicated.(3) If a shorted or open diode is detected, replacethe entire heat sink assembly.5-29